{
  "id": "non-empty-alt",
  "evaluate": "attr-non-space-content-evaluate",
  "options": {
    "attribute": "alt"
  },
  "metadata": {
    "impact": "critical",
    "messages": {
      "pass": "Element has a non-empty alt attribute",
      "fail": {
        "noAttr": "Element has no alt attribute",
        "emptyAttr": "Element has an empty alt attribute"
      }
    }
  }
}